Antioxidant defense aging describes age-related decline in cellular systems that neutralize reactive oxygen species. Antioxidant enzymes and redox buffering molecules become less responsive with age. This decline limits the ability to counteract oxidative stress, amplifying molecular damage. Antioxidant defense aging affects mitochondrial stability, immune balance, and metabolic regulation. Reduced antioxidant capacity contributes to redox imbalance and cellular dysfunction. Understanding antioxidant defense aging highlights importance of maintaining redox control to preserve cellular health during aging.
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